<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Fit to the bounds of a LineString</title>
    <meta
      name="viewport"
      content="initial-scale=1,maximum-scale=1,user-scalable=no"
    />
    <script src="../../lib/mapbox-gl.js"></script>
    <link href="../../lib/mapbox-gl.css" rel="stylesheet" />
    <script src="../../lib/axios.min.js"></script>
    <style>
      body {
        margin: 0;
        padding: 0;
      }
      #map {
        position: absolute;
        top: 0;
        bottom: 0;
        width: 100%;
      }
      .btn-control {
        font: bold 12px/20px "Helvetica Neue", Arial, Helvetica, sans-serif;
        background-color: #3386c0;
        color: #fff;
        position: absolute;
        top: 20px;
        left: 50%;
        z-index: 1;
        border: none;
        width: 200px;
        margin-left: -100px;
        display: block;
        cursor: pointer;
        padding: 10px 20px;
        border-radius: 3px;
      }

      .btn-control:hover {
        background-color: #4ea0da;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <button id="zoomto" class="btn-control">Zoom to bounds</button>
    <script>
      let baseDataUrl = `http://${localStorage.getItem(
        "host"
      )}/mapbox-gl-js-offline-examples`;
      axios
        .get(
          baseDataUrl +
            `/resources/styles/${localStorage.getItem(
              "mbtilesStylesName"
            )}.json`
        )
        .then((res) => {
          let data = res.data;
          initMap(data);
        })
        .catch((err) => {
          console.error(err);
        });

      function initMap(style) {
        let map = new mapboxgl.Map({
          container: "map",
          center: [-77.0214, 38.897],
          zoom: 12,
          style: style,
        });
        // A GeoJSON object with a LineString route from the White House to Capitol Hill
        var geojson = {
          type: "FeatureCollection",
          features: [
            {
              type: "Feature",
              geometry: {
                type: "LineString",
                properties: {},
                coordinates: [
                  [-77.0366048812866, 38.89873175227713],
                  [-77.03364372253417, 38.89876515143842],
                  [-77.03364372253417, 38.89549195896866],
                  [-77.02982425689697, 38.89549195896866],
                  [-77.02400922775269, 38.89387200688839],
                  [-77.01519012451172, 38.891416957534204],
                  [-77.01521158218382, 38.892068305429156],
                  [-77.00813055038452, 38.892051604275686],
                  [-77.00832366943358, 38.89143365883688],
                  [-77.00818419456482, 38.89082405874451],
                  [-77.00815200805664, 38.88989712255097],
                ],
              },
            },
          ],
        };

        map.on("load", function () {
          map.addSource("LineString", {
            type: "geojson",
            data: geojson,
          });
          map.addLayer({
            id: "LineString",
            type: "line",
            source: "LineString",
            layout: {
              "line-join": "round",
              "line-cap": "round",
            },
            paint: {
              "line-color": "#BF93E4",
              "line-width": 5,
            },
          });

          document
            .getElementById("zoomto")
            .addEventListener("click", function () {
              // Geographic coordinates of the LineString
              var coordinates = geojson.features[0].geometry.coordinates;

              // Pass the first coordinates in the LineString to `lngLatBounds` &
              // wrap each coordinate pair in `extend` to include them in the bounds
              // result. A variation of this technique could be applied to zooming
              // to the bounds of multiple Points or Polygon geomteries - it just
              // requires wrapping all the coordinates with the extend method.
              var bounds = coordinates.reduce(function (bounds, coord) {
                return bounds.extend(coord);
              }, new mapboxgl.LngLatBounds(coordinates[0], coordinates[0]));

              map.fitBounds(bounds, {
                padding: 20,
              });
            });
        });
      }
    </script>
  </body>
</html>
